JPH0840262A - Driving device for railroad rolling stock - Google Patents

Abstract

PURPOSE:To use an electric motor shaft and a pinion shaft in common, and remove a universal joint, and secure the high speed operation, by installing the rotor of an electric motor at the extension part of the pinion shaft supported by the bearing of a gear device, as for a device for driving a wheel through the gear device by the electric motor. CONSTITUTION:A gear device 17 is supported on an axle 7 by a bearing 20. The pinion shaft 12 of the gear device 17 is supported by a plurality of bearings 19 and 21. At the extension part of the pinion shaft 12, the rotor 14 of an electric motor 13 is installed. The stator 15 of the electric motor 13 is arranged outside the gear device 17. Accordingly, a rotor 14 uses the bearings 19 and 21 supporting the pinion shaft 12 in common, and the installation work of the electric motor 13 is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor and a gear device for a vehicle drive device of an electric railway.

[0002]

2. Description of the Related Art A conventional drive device for an electric carriage in an electric railway will be described with reference to the drawings. FIG. 6 is a plan view of essential parts showing an example of a bogie for a railway vehicle having an electric motor 2 mounted on a bogie frame 1 and a gear device 4 mounted on an axle 7.
FIG. 7 is a side sectional view of FIG. 6 and 7, the torque of the electric motor 2 is transmitted to the pinion shaft 5 of the gear unit 4 by the universal joint 3, reduced in speed by the gear mechanism, and transmitted to the large gear 6. Since the large gear 6 and the axle 7 and the axle 7 and the wheels 8 are fitted to each other, the electric motor 2 transmitted to the large gear 6
Torque is transmitted to the wheels 8 and the surface of the rail 9 obtains an adhesive force to drive the electric carriage.

Generally, a shaft spring (not shown) is installed between the bogie frame 1 and the axle 7, and the fluctuation of the weight of passengers and loads is absorbed by the spring deflection, so that the bogie frame 1 moves up and down. It is designed to move to. A suspension rod 10 is provided between the gear device 4 and one end on the pinion shaft side to elastically support the gear device 4, and the elastic body 11 absorbs the transmission torque of the electric motor 2. Then, the pinion shaft 5 becomes the axle 7
The center of the elastic body 11 is moved by an angle corresponding to the amount of deflection of the elastic body 11. As described above, the axis of the electric motor 2 mounted on the bogie frame 1 and the pinion axis of the gear device mounted on the axle 7 are not located on one axis due to fluctuations in the number of passengers and transmission torque, The joint 3 is eccentrically coupled to transmit torque.

[0004]

In response to the demand for speeding up logistics in recent years, the high speed of the vehicle has been dealt with by increasing the rotation speed of the electric motor. If this is done, the following problems will occur. (1) There are restrictions in the design of universal joints due to dimensional restrictions such as rail width and wheel diameter, and most of them have a flat shape in the axial length direction, and since the universal joint is an eccentric joint, When the rotational speed is increased, the vibration of the joint increases, which causes noise in the joint. (2) Since the universal joint is an eccentric coupling, the bearing that supports the pinion shaft of the motor shaft must take measures against eccentric load at the same time as measures against high rotational speed such as lubrication, and the burden such as extra mechanical strength is expected. Reduces the degree of freedom in design, increasing the difficulty in achieving high rotational speeds. (3) When the electric motor is rotated at a high speed, the bearing lubrication of the high speed shaft cannot satisfy the required obligation with the grease lubrication used in the ordinary electric motor.

[0005]

In view of the above points, the present invention has been made for the purpose of eliminating the eccentric coupling by the conventional universal joint in order to increase the rotation speed of the electric motor, that is, the conventional universal joint. Instead of transmitting the torque of the electric motor to the pinion shaft of the gear device by using, the electric motor shaft and the pinion shaft of the gear device are commonly integrated, and the torque is directly transmitted by one shaft. The rotor of the electric motor is attached to the extension of the pinion shaft supported by the bearing of the device, and the stator is attached to the outer wall surface of the gear device.
The reduction gear ratio of the gear device is set to a higher ratio than in the past, and an electric motor of high rotation speed is used.

Further, the inside of the electric motor and the inside of the gear device are communicated with each other, and the pinion shaft is arranged at a position where the gear device is immersed in the lubricating oil, and the electric motor is oil-cooled. Furthermore, when another medium is used for cooling the electric motor and it is desired to prevent the gear lubricating oil from entering, a partition wall is provided between the stator and the rotor of the electric motor.

[0007]

In the railway vehicle drive device according to the present invention, the reduction gear ratio of the gear device is set higher than that of the conventional one, and the electric motor shaft and the pinion shaft of the gear device are the same shaft. The bearing of the rotational speed is simplified without the burden of the eccentricity of the joint, and the conventional measures against vibration, noise and mechanical strength due to the eccentric coupling can be completely eliminated. Since the bearing of the pinion shaft of the gear unit is oil-lubricated, it is easy to increase the speed.Since the rotor of the electric motor is mounted on the extension of the pinion shaft and the stator is mounted on that part from the outside, the structure is simple. Can be converted. Further, by sharing the lubricating oil of the gear device for cooling the electric motor, it is possible to make the electric motor smaller and lighter than the conventional one.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example according to claim 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional plan view of an essential part shown for explaining one embodiment of the present invention, and FIG. 1 is a side sectional view of FIG. 1 and 2, the gear device 17 has a bearing on the axle 7.
It is supported by 20 and installed. Various reduction mechanisms can be used for this gear device as long as the reduction ratio is higher than the conventional one, but here, a two-stage reduction gear device will be exemplified. Gearbox 17
The pinion shaft 12 is supported by bearings 19 and 21, the rotor 14 of the electric motor 13 is mounted on the extension of the pinion shaft 12, and the stator 15 is attached to the outside of the gear device. Thus, the rotor of the electric motor shares the bearing that supports the pinion shaft, and the work of mounting the electric motor can be greatly simplified.

As the electric motor 13, an AC machine such as an induction machine is used, and a high speed (20,000 rotations /
Drive for about a minute). The lubricating oil of the gear unit 17 is the pinion shaft.
Even if the wire 12 is penetrated into the electric motor 13, since it is an AC machine that does not have a commutator or a brush unlike the DC machine that has been widely used in the past, this is not a serious problem.

Next, an example according to claim 2 will be described based on FIGS. 3 and 4. FIG. 3 is a cross-sectional plan view of an essential part shown for explaining another embodiment of the present invention, and FIG. 4 is a side cross-sectional view of FIG. 3 and 4, the inside of the electric motor 13 and the inside of the gear device 17 are communicated with each other through the opening 22, and the pinion shaft 12 of the gear device is provided at a position that is below the oil level 23 of the lubricating oil. Used to cool the electric motor by introducing lubricating oil inside. As a result, the cooling efficiency is improved and the size of the electric motor can be further reduced.

Further, an example according to claim 3 will be described with reference to FIGS. FIG. 5 is a cross-sectional plan view of an essential part shown for explaining still another embodiment according to the present invention, and FIG. 4 is also used as a side cross-sectional view of FIG. In some cases, it is desirable to cool the stator of the electric motor with another medium without infiltrating the gear lubricating oil. In that case, in FIG. 5, the stator 15 and the rotor of the electric motor 13
A nonmagnetic or nonmetallic partition wall 24 is provided between the rotor 14 and
The lubricating oil is guided to and cooled only through the opening 22. As a result, it is possible to prevent the organic material such as the stator winding and the insulating material from eluting into the lubricating oil, and the winding and the insulating material suitable for the cooling medium can be adopted.

When the gap length between the stator and the rotor becomes a problem by providing the partition wall, a synchronous machine using a permanent magnet rotor, or a so-called loose brushless DC motor combining the synchronous machine with power electronics. This can be easily done by adopting a drive system called. In the case of a brushless DC motor, a sensor for detecting the rotor position is required, but it is a usual means to estimate and control the position indirectly without using a sensor or using a sensor without them. Therefore, the description is omitted.

[0013]

The railway vehicle drive device according to the present invention comprises:
Since it is configured as described above and is a joint without a joint in which the pinion shaft of the gear device and the motor shaft are integrally integrated, the conventional universal joint can be abolished. This can be achieved freely, and it is possible to reduce the size and weight of the electric motor situation.

Further, since the bearing of the electric motor also serves as the bearing of the pinion shaft, oil bath lubrication on the gear unit side can be applied.
It is possible to easily solve the problem of bearing lubrication, which has been a major problem in high-speed motors. Further, since the rotor of the electric motor is arranged outside the gear bearing, the stator of the electric motor can be easily attached / detached, which is advantageous in fitting / maintenance to the vehicle.

When the electric motor is cooled by utilizing the lubricating oil of the gear device, another cooling device for the electric motor is not required, and the fitting space is improved. Although an example of driving the axle has been shown above, the present invention can be easily applied to a drive system for each independently rotatable wheel by considering the coupling between the gear device and the wheels.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of essential parts shown for explaining an embodiment of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a cross-sectional plan view of an essential part shown for explaining another embodiment of the present invention.

FIG. 4 is a side sectional view of FIGS. 3 and 5.

FIG. 5 is a cross-sectional plan view of an essential part shown for explaining yet another embodiment of the present invention.

FIG. 6 is a plan view of a main part showing a conventional example.

FIG. 7 is a side sectional view of FIG.

[Explanation of symbols]

 1 bogie frame 2 electric motor 3 universal joint 4 gear unit 5 pinion shaft 6 large gear 7 axle 8 wheel 9 rail 10 suspension rod 11 elastic body 12 pinion shaft 13 electric motor 14 rotor 15 stator 17 gear unit 18 pinion 19 bearing 20 bearing 21 Bearing 22 Opening 23 Oil level 24 Partition wall

Claims (3)

[Claims] 1. A drive device for a railway vehicle in which wheels are driven by an electric motor via a gear device, wherein a rotor of the electric motor is mounted on an extension portion of a pinion shaft supported by a bearing of the gear device. Railway vehicle drive unit. 2. The railway vehicle drive device according to claim 1, wherein the electric motor shaft is arranged at a position where the inside of the electric motor and the inside of the gear device are communicated with each other and are immersed in the lubricating oil of the gear device. 3. The railway vehicle drive according to claim 1 or 2, wherein a partition wall is provided between the stator of the electric motor and the rotor, and the electric motor shaft is arranged at a position where only the rotor is immersed in the lubricating oil of the gear unit. apparatus.